Injection molding apparatus having magnetic valve pin coupling
US7931455B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 8, 2009 |
| Grant date | Apr 26, 2011 |
| Priority date | — |
| Expiry date | Oct 16, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/2813
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An actuated part, such as a valve pin plate or actuator piston, is movable in forward and rearward directions. A coupling part is located rearward of the actuated part and held in position by magnetic attraction between the coupling part and the actuated part. A valve pin is coupled to the coupling part. The valve pin extends in the forward direction for opening and closing a mold gate. When a stopping force applied to the valve pin is greater than a force of the magnetic attraction between the coupling part and the actuated part, the actuated part moves away from the coupling part in the forward direction, thereby reducing the stopping force on the valve pin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.